Let-off mechanism for looms.



ir.. Mmmm., 'l LET-0IT MBGHANISM POB LOOKS.

' Panend'sepn 22,1908.

APPIJGATIO! FILED SEPT. 1B, 1901- JOHN NAZARIAN, OF SYRACL'SE, NEW YORK `matr-OFF macnnnism non Looms. Y

A spciaeatin Ginette@ Patent. c Patented sept. 22, 1908i Application led September 18, 1907, Serial No. 393,548.

To all whom it may "concern: l

`Be 1t known that I, Joux "NAZARIAN, of

' Syracuse, in' the county of .Onondaga-7 in the State of New `i'ork', have invented new and useful Improvements in Let-Oil Mechanism for Looms, of' which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relatcs to certain improvements in let olf mechanism for looms, and refers more particularly to means for frictionally retarding the rotary action of the beam of what is commonly known as the let-olf motion.

)Iy object, therefore, is to equip the letoff beam with one or more spring pressed friction devices wherebv'the tension of the warp may be varied. v Y Other objects and uses relating to the spe cific construction of the various parts ol the retardiiig action will bc brought out in the following description.

In the drawings-l1`igure` 1 is aperspective view of ay looi'n showing my improved friction retarding device for the let-oil'v beam. Fig. 2 is an enlarged end view of one of the friction i retarding devices and let-olibeam or roller upon which it is mounted. Fig. 3v is a sec.- t-ional view taken on line 3-3, Fig showing one vend of the beam partly in elevation.

The friction retarding device and counter mechanism forming t-lie subject-matter of my. present invention may be appliedto any modern loom using a rotary let-olf, and in order to clearly demonstrate the practicability of my invention, vI have shown a pair of friction ret'ardin'g devices as applied to the opposite ends of a rotary let-oill device or reel j-1-, which is journaled at its ends in suitable bearings -2-, while its intermedi ate portion is circular and adapted to receive a quant-ityof warpA which is unwound or let off from the reel in the usual manner during the operation of weaving.

As previously stated, these friction devices are vmounted upon the opposite ends of the reel, preferably just inside of the bearings 2+ and each preferably consists of a inetal. lie friction band -3 having an enlarged central annular bearing -45- of less width than the band-3- forming opposite annular shoulders '-5- ofless diameter than the circular bearing -4- forreceivi'ng opposite rctainer rings '-6 which lare located at opposite sides of and .project some distance radiallybeyond the bearing face -4-. .In other words, the'rings 6 are rotatably mounted upon the annular shoulders 5- at opposite sides of the bearing face .f4-1 and are detachably secured to a eircuinferentially movable frame -7- carrying asc-ries of friction devices -8-, presently described. The circular bands 3* are secured to o Osito ends of the let-ofi' reel -leby suitablel fas'- tening means, as pins `--9-, *whichV are passed through apertures in axially projecting flanges of the band -3-,Y said Han es extending in opposite directions some istance beyond theopposite faces of thel enlarged'central portion of the friction band t0 afford a reasonable broad bearing on the beam or reel. These bands, therefore, become a permanent partof and rotate with the reel while the frame-'iis separate and is movable circumfcrentially around and upon the ciieulai' bearing face -4 and held in place by the circular retainer rings -6- which encircle and bear upon't-he annular bearings and also against the sides of the enlarged cent-ral portion of the band-3`-, upon which the circular bearing -4-A is formed. These retainer rings -6 project some distance radially beyond the circular bearingface -4- and are provided with apertures for receiving the studs 1l-s which are secured to the inner side of the frame -7- or -rather to that portion of the frame which rides upon the circular bearing face -4-, thereby locking the frame and rings together to perniitl'said frame and friction devices -Q- carried `thereby t-o be adjustc d circumferentially around and upon the rings 3.

The frame -7- 1s adapted to support a plurality of, .1n this instance, four radial] projecting friction plungers S- and pre erably comprises inner and outer concentric segments spaced some distance apart and united at their ends by radial tie bars 21 forming an open segmental frame. n

T he plungeis -S- are arranged side by side circuinferentially of and against the circular bearing face 4- and are guided inv radial apertures 12- in the inner segment of the frame -7- each plunger having at its outer end a loose collar13 and a reduced stem l.4--'which enters the socket in the inner end of a radial adjusting screw 15'-, the latter extending outwardly thi 'j 'igh and beyond radial.apertures 16 in the outer-segment of the frame and terminates in an angular end adapted to receive a wrench or other device 'I whereby the adjusting screw i5v may be ro,-

i readily accomplished whereby thetension of the spring, and therel tated to force the ,inner end of its plunger into close roximity to the bearing face -4.

pressed against the bearing face '-4 of theI ring 3fby a. separate coil spring 17- sur- I i rounding the adjusting screw 15 and having one. end bearing against the collar 134- and its other end engaged by an adjusting nut 1S on 'the adjusting screw 15?- just within the outer segment of the frame -7-,

fore, the pressure of the friction plunger may be readily varied at will to produce the de# sired frictional retarding action of therotary beam or reel -1`-. l

Each collar 1.3- is loosely mounted upon the inner end of the plunger s tein 14 and bears against the outer face of the plunger vS-, ieing held against undue outward radial movement by a pin I9- which passes through an aperture in the stein 14 and Y projects radia ly some distance therefrom to interlock with corresponding recesses in the inner end of the adjusting screw ,1 5, said pin 19 serving to lock the plunger -8- and its adjusting screw 15- to rotate together, although the plunger with its collar 13 thereon may be readily. withdrawn from the socket in the innerend of the adjusting screw when the frame is removed from the ,ring-3# the recesses in the inner end `of the screw -15-.- being open at the bottom to permit the springs -17- to force their plungers againstV the bearing -4-. This removal of the fra-me- -,-3- may be by simply loosening the clamping bolts -1'1- and removing the rings- 6; fromcoiiiiection with the frame 7 whereupon said frame may be lifted radially from between the rings and by removing the pins 19-y the plungers 8 may be withdrawn inwardly from their. apertures 12 in` which they are guided, thus permitting the screws 15-` to be screwed inwardly 'until disengaged from the outer segment of the frame -7 i Each friction plunger and its adjusting means are identical7 and therefore, the saine description hereinbefore given applies to all vof them, and in fact, in some instances, I may prefer to employ a single radially movable lunger spring pressed against the bearing iiice -4t-, with means for varying the tension of the spring, and thereby varying the degree of pressure with which the plunger is pressed against the circular bearing face 4 of the ree 1. y

It is clear from the foregoing description that with the actioiiof thel spring iressure of the plungers -S-e u io'nythe circuia'r bearing facev 4-of the reei the fraine7 is free to iiove or to be adjusted circ-iiniferentially around lsaid bearing face, and that while the plungers bear radially against one side "of the .-6- are thereby forced into frictional enso that the friction pressure is really exerted at diametrically opposite sides of the band. i The frame '-7- is made of com iaratively x light cast niet al and in v iew of the fact that a. j large portion of the strain due to the tension of the s )rings 17- is borne by the out-er seginent of the frame, said outer segment is tied to the inner segment b v tie bolts 21 which are located at regular intervals between the end .tie pieces of the frame and alternatewith the adjustin i screws -15-, the latter being also arranged at regular intervals a uniform distance apart between the end pieces'of the frame.

The reel or let-ofi' beam --1- for thewarp rotates in the direction indicated by arrowon the reeL That is, the frictional connecattacliing l elements A tion between the bearing faces -4 of the reel and friction devices -S and 6-, Ion the f rame tend to rotate the frame in the saine direction as the reel, thereby exerting. an upward pull upon the indicating devicev '-24 to indicate tie amount; of tension exei'ted ii )on the. warp, which-iswound u on the reci, and this tension may be varied) at will by simply adjusting the nuts-18 0r screws 15.

'hat I claim is: 1 1. In a. loom, a let-off reel having an annular bearing face, a frame movable circuiiiferentially around and upon said bearing face, a: radially movable plunger sprin pressed against the bearing face of the ree the. spring and means for adjusting the tension of the spring.

2. In a loom, a let-ofi reel having a circu- \lar friction face in coinl-iination with a frame l mounted on the rcel and movable circumferentially, a friction plunger mounted in the` frame, a spring for pressing said plunver"- against the friction face of the reel wherby v a radially movable plunger guided in the iframe and bearing on said friction face,'a,

lar friction face, a frame mounted on the reel,-

spring for forcing said plunger into engagei'ne'nt with said friction face, means for tensioning said spring, and additional means for indicating the degi'ee'of pressure exerted by the plunger upon the friction face of the reel. 4.; In a leoni, a let-ot'reel having 'a circular friction face., a. frame movable circumferentially relatively to said friction face, `a

bearing upon said iriftion face, separate nient with the friction face, separate means for adjusting'the tension of said springs, and means for limiting the movement of said frame.

5. In a. loom, a let-oli` reel having an annular bearing, a plunger spring pressed against the bearing, a'supportiug frame iorthe plnnl,

ger movable circumferentia'lly of and upon thebea'ring and tending to rotate with the reel by reason ofthe friction of the plungers7 and yielding means for resisting such rotation.

6. In a loom, a let-ofi' reel having an annular bearing, al series of' plungers spring pressed againstsaid bearing, a supporting frame for said pluiigers movable circumferentially relatively to and upon the bearing and tending to rotate with said hearing by reason of the friction between the'plungers and bearing, and a measuring device includthe degree of power tending to rotate the frame with said bearing.

7. In a loom, a let-cti reel having a. circular friction band, a ring encircling the band, a frame secured to the ring, a plunger on the frame, a spring iortorcing said plunger into frictional ei'igagenicnt. with the band, means for ladjusting. the' tension of the spring, the frictional engagementoi the ring and plunger with the band operating to move the frame circumferentially of the reel and yield'- ing means to retard the action of the frame.

S. In a loom, a let-ofi reel having ateach end a friction band, cach friction band having a centra-I annular bearing' and reduced circuinferentially around said bearing, sep- 1 each frame, the rings of each pair encirchng the reduced ends of the adjacent band to hold the frame in operative position, friction the adjacent annular bearings, springs for separate adjusting devices for varyiner t tension of said springs, and separate yieding i means connected to the frames for holding the same against undue rotation with the reel. f

; tion band provided with 'a central annular shearing, and reduced ends, a plunger and supporting frame resting upon the annular bearing, rings encircling the reduced en ds of the band and intel-locked with the frame to hold the latter in operative osition u-pon the reel, a radiallj)- movable p unger guided in the frame and having its inner end frictionallj.' engaged with said bearing, .a spring for forcing the plunger against said hearing, and means for adjusting thel tension of the spring.

f, 10. In a looiii, a let-ofi reel having an annular bearing, a plunger supporting frame resting von said hearing, a plunger guided inv ing yielding means for resisting thc. rotation of said frame with the bearing and indicatingsaid iranie and frictioiially engaged with said hearing, a s ring for forcing the plunger i against said iearnig, means for varying the g tension of said spring, a second spring iavl ing one end connected to a fixed anchorage l and its other end connected to the frame to ll resist undue rotation ot the frame with the i' reel, andl lin eans for indicating the frict-ional *l poi'er tending to rotate the frame with'tlie ree A l In witness whereof I have hereunto set my l hand this 14th dayv of September 1907. c v l JonNv NAZARIAN. l Witnesses:

' H. E. CHASE,

l MILDni-:n M. NOTE.

A plungers'guided-in the fraineand engaging series of plui'igers mounted in the fraine andiL I forcingY said plungers against -their bearings, springs for forcing said plungers into engagcie 9.A In a loom, af letoi` reel having a fric- 

